I have read A LOT of articles
Here is what I did, as I've been struggling with this for a long time...
Creating and modifying
/usr/share/X11/xorg.conf.d/20-intel.conf file with the following lines...
Option "Backlight" "intel_backlight"
...didn't work at all
I was using
xbacklight option for some time, but it didn't satisfy me, as I knew it must be possible with Linux native way.
I've tried many GRUB options without effect, so I was googling again and again, coming back to solve this issue.
Today I came to the solution, which is following:
- You need to kill your display manager, to create new Xorg.conf file (because it runs X server):
- Press Ctrl+Alt+F1 (Dont panic, while your Window system is runing, you can go back with Ctrl+Alt+F7)
sudo service lightdm stop and press Enter(e.g. gdm, kdm, xdm)
- Create new Xorg configuration file
X -configure and press Enter
mv xorg.conf.new /etc/X11/xorg.conf and press Enter
- Start X Server (you can do it all without GUI via command line, but I was more comfortable with this aproach):
sudo service lightdm start and press Enter(e.g. gdm, kdm, xdm)
- Modify Xorg.conf file
- navigate to
/etc/X11/xorg.conf and open Xorg.conf (in my case latest was xorg.conf.05312015) via leafpad (e.g. gedit, pluma)
- search for
Section "Device" and then for
Driver (on my PC it said
Driver "intel" by default, but it could be something else, so change it to
- add line
Option "Backlight" "intel_backlight" after
Driver "intel" (it doesn't really matter where, as long as it stays in Device Section)
sudo gedit /etc/default/grub (e.g. leafpad, pluma...)
- set to
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=" (
acpi_osi= did it for me, other options didn't work...)
- in terminal type
sudo update-grub and press Enter
- or use GRUB customizer:
sudo add-apt-repository ppa:danielrichter2007/grub-customizer
sudo apt-get update
sudo apt-get install grub-customizer
Funny thing is, that code is exactly the same as in
/usr/share/X11/xorg.conf.d/20-intel.conf, but that way it worked as expected!